@Article{ 
  AmbBra90a,
  author = { Ambrosio, Luigi and Braides, Andrea },
  title = { Functionals defined on partitions of sets of finite perimeter, II: semicontinuity, relaxation and homogenization },
  journal = { J. Math. Pures. Appl. },
  year = { 1990 },
  volume = { 69 },
  pages = { 307-333 },
  URL = { http://cvgmt.sns.it/paper/1820/ },
  note = { cvgmt preprint}
}